Electric hoist.



No. 740,166. PATENTBD SEPT. 29, 1903.

M. B. MGLAUTHLIN.

ELECTRIC HOIST.

APPLICATION FILED MAR. 29, 190 2. HO MODEL. 3 SHEETS-SHEET 1.

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PATENTE'D SEPT. 29, 1903.

MQLAUTH LIN.

HOIST.

MAR. 29, 1902.

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APPLICATION 3 SHEETS-SHEET 2.

Invader: hazy; /5. a "W Witnesses V WGW No. 740,166. PATENTED SEPT. 29,1903. M. B. MQLAUTHLIN.

ELECTRIC HOIST.

APPLICATION FILED MAR. 29, 1902.

H0 MODEL. 3 SHEETS-SHEET 3.

UNITED STATES i atented September 29, 1903,

PATENT OFFICE.

ELECTRIC HOIST.

SPECIFICATION formingpart of Letters Patent No. 740,166, dated September29, 1903. Application filed March 29, 1902. Serial No. 100,639- (NomodeLl To aZZ whom, it may concern.-

lle it known that I, MARTIN l3. MCLAUTH- LIN, of Malden, in thecountyo'f Middlesex and State of Massachusetts, have invented certainnew and useful Improvements in Electric Hoists, of which the followingis a specification.

This invention relates toclectric motors, and particularly such as areused for hoisting or elevator purposes.

The object of the invention is to secure greater compactness andprotection for certain parts, and this end I secure by constructing themotor in the manner hereinafter described and claimed.

Of the accompanying drawings, Figure 1 representsa longitudinalsectional view of an electric hoist constructed in accordance with myinvention. Fig. 2 represents a plan view, partly broken away and insection. Fig. 3 represents a section on the line 3 3 of Fig. 1. Fig. 4represents a section on the line 4 4 of Fig. 1. Fig. 5 represents asection on the line 5 5 of Fig. 1. Fig. 6 represents a section on theline 6 6 of Fig. 1.

The same reference characters indicate the same parts in all thefigures.

In the drawings, 10 represents a base having vertical bearing-standards11 12 13, in which are journaled the rotating parts of the mechanism.The armature and field of the motor are both mounted to rotate,-thearmature within the field, and the winding-drum of the mechanism I mergeor incorporate with a portion of the field.

14 represents the windingdrum, having an outer periphery grooved at 15to receive the hoisting-cable 16 and having cast with it the cores ofthe field-magnets 17 17. A flange or disk 18 is secured by bolts 19 19to lugs 20, located between the field-magnet coils, said disk having ajournal 21 formed on it and mounted in a bearing in the standard 12. Inthe opposite end of the drum is bolted a flange or disk 23, havinga'journal 24 mounted in a bearing 25 at the upper end of the standard11.

26 represents the armature, having trunnions 270 271 journaled in thewinding-drum journals 21 24, which are made hollow for that purpose andprovided with suitable bearing sleeves or bushings.

27 represents the commutator of the armature 2G, and 28 28 represent thebrushes carried by the disk 23 and suitably insulated therefrom. Fixedto the journal 24 is a shaft 29, bearing a series of collector-rings 3030, connected with the various leads or wires 31 31, leading from thebrushes and field-magnet windings andv extending through openings 32 32in the journal 24. A series of brushes or collectors 33 33, stationarilymounted on a support 34, run in continuous contact with the rings 30 andare connected with suitable wires, whereby the field-magnet andarmature-circuits may be connected with suitable external points. p

An advantage obtained by this construction is that ample room isprovided for the collectors and brushes, avoiding opportunity forshort-circuits, which would occur if the collectors were crowded withina limited space. This arrangement also leaves the web of the drum 14free and allows the bearing 25 to be brought as close as desired to thedrum, being, in fact, partly within the limits of the drum in theconstruction which I have illus trated.

The armature-trunnion 271 is carried outwardly and journaled in abearing on the standard 13, and on said trunnion is fixed a pinion 35,meshing with a gear 36, attached to a counter-shaft 37, mounted inbearings in standards 12 and 13. Fixed to said countershaft is a pinion38, meshing with a gear 39, attached to a second counter-shaft 40,journaled in bearings in the standards 12 13. On

the inner end of the counter-shaft 40 is fixed a pinion 41, meshing withan internal gear 42, formed on the disk 18. In this manner the armatureis caused to rotate at a relatively high speed with respect to thewinding-drum 14 owing to the reducing-gearing, and the two rotate in thesame direction. Any other form or system of gearing than that showncould be employed-as, for instance, worm-gearing which would prevent therotation of the winding-drum from causing that of the armature when nocurrent was on or the load overbalanced the power of the motor. Thereducinggearing is suitably proportioned, so as to give the desiredrelative speed to the armature and field, the speed of the field and ofthe wind ing-drum being much slower than that of the armature, asrequired for the winding-drum of a hoisting apparatus. The armatureevidently rotates faster when running in the same direction as the fieldthan it would have to rotate if the field were rotated in the oppositedirection from the armature or were stationary, other things beingequalthat is to say, for a given differential or diiference in rotativespeed between armature and field the armature rotates fastest whenrunning in the same direction as the field. The advantage of this inconnection with an elevatorhoist is that the armature takes longer toattain its full speed at starting, and hence gives a gradualacceleration or easy start to the car or other device connected with thehoist.

It will be noted that I secure great compactness by merging thewinding-drum with one of the rotating parts of the motor and affordprotection to certain parts, such as the armature, commutator, brushes,and a part of the gearing illustrated in the drawings as inclosed withinthe Winding-drum. Compactness and economy of material are furthersecured by making the winding-drum 14constitute a part of the magneticcircuit of the field-magnets.

Although I do not wholly restrict myself to an integral field-yoke andwinding-drum, yet the described arrangement enables me to use this orequivalent means, whereby the amount of iron in the field-yoke may bedecreased or rather merged in the metal of the drum and additionalcompactness secured over former apparatus of this class.

I claim-- 1. In an electric elevating or hoisting apparatus, a rotaryhoisting-drum carrying a rotary motor-field, an armature mounted torotate within said drum and field, a journal for the drum. having one ormore conductorchannels, conductors occupying said channels for carryingthe current to and from the drum, collectors on said journal connectedwith said conductors, and a bearing for said journal interposed betweensaid collectors and the drum.

2. In an electric elevating or hoisting apparatus, a rotarywinding-drum, a rotary motor field carried thereby, an armature mountedto rotate within said drum and field, and gearing connecting said drumand armature and causing said armature to rotate in the same directionthe drum and at a greater speed, for the purpose specified.

In testimony whereof I have affixed my signature in presence of twowitnesses.

MARTIN B. MCLAUTHLIN.

WVitnesses:

R. M. PIERsoN, GEORGE PEZZETTI.

